<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button id="btn1">11111111</button>
    <script>
      const bucket = new Set();
      const data = { text: "hello world" };
      let activeEffect;
      function effect(fn) {
        activeEffect = fn;
        fn();
      }
      const obj = new Proxy(data, {
        get(target, key) {
          console.log("get", key);
          if (activeEffect) {
            bucket.add(activeEffect);
          }
          return target[key];
        },
        set(target, key, newVal) {
          console.log("set", key);
          target[key] = newVal;
          bucket.forEach((fn) => fn());
          return true;
        },
      });
      effect(() => {
        console.log("effect")
        document.body.innerText = obj.text;
      });

      setTimeout(() => {
        obj.text = 6666;
      }, 1000);

      // setTimeout(() => {
      //   obj.notExist = 8888;
      // }, 3000);
    </script>
  </body>
</html>
